Effect of feeding frequency on the growth of common carp ( Cyprinus carpio L.) fry

Transcription

1 BangladeshJ. Fish. Res., 5(2), 2001: Effect of feeding frequency on the growth of common carp ( Cyprinus carpio L.) fry S. M. Sultana, M. Das* and S. C. Chakraborty 1 Department of Aquaculture, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh 1 Department of Fisheries Technology, BAU, Mymensingh, 2202 *Corresponding author Abstract A laboratory-feeding trail was conducted for 45 days with fry of common carp Cyprinus cmpio L. (0.45±0.03g) in aquaria in a static indoor fish rearing system. The fry were fed on a pelleted diet containing 33% crude protein having fishmeal as major protein source. The fish fry in five treatments A, B, C, D, and E, each with two replicates were fed on 5% daily ration divided into different feeding frequencies of 2, 3, 4, 5 and 6 times a day respectively in order to observe the growth performance. Each replicate contained 15 fry having total initial weight of 6.87±0.31g. At the end of the feeding trial, significantly different and higher (p<0.05) growth response was observed in treatment C having a feeding frequencies of 4 times a day. Significantly the highest and the lowest percent growth of and % were observed in fish fed on the diet (Treatment C) with 4 times and (Treatment A) 2 times feeding frequencies per day, respectively. Food conversion ratio (FCR) of 1.78 was significantly higher (p<o.os) in fish fed on the diet having 2 times feeding frequencies whereas, the least value of 1.22 was obtained in fish fed on the diet with 4 times daily feeding. Protein efficiency ratio (PER) ranged from 1.68 in fish in treatment A having a feeding frequencies of 2 times per day to 2.48 in fish in treatment C fed on the diet with 4 times feeding frequencies. Other growth parameters viz, specific growth rate (SGR), apparent protein digestibility (ADP) were also higher in treatment C than the other treatments. The results of the present study demonstrated that the growth performance of C. carpio was the best at 4 times feeding in a day using 33% dietary protein containing fish meal as major protein source. Key word: Feeding frequency, Cyprinus carpio, Fry Introduction Expansion of aquacultural practice of a target species greatly depends on feeding technology and feed cost is one of the largest operational costs in aquaculture (De Silva and Davy 1992). The feed to be presented to the target species should be nutritionally balanced, easily utilizable and also digestible for the viability of the aquacultural practice. In general the feeding regime and growth of fish are very much related. It is evident from earlier studies that the rate of feeding alters nutrient intake and digestibility, as excess feeding may lead to leaching of nutrients and limited feeding may

2 S. M. Sultana eta!. suppress growth due to starvation (Hepher 1990). Feeding frequency may provide maximum utilization of diet by providing best FCR and weight gain of cultured fish species. Therefore, an important step in the feeding strategy is to determine the optimal frequency of feeding for the target species in aquaculture to get desired growth of fish. Multiple feeding results in a more efficient utilization of the feed than a single feeding (Murai and Andrews 1976). The number of feeding per day and the time of feeding vary with species, size of fish and environmental conditions. It is also affected by gut transit time, gastric evacuation time, exposure of feed with gastric juices, retention time, feed quality, meal size and gut length. Among the popular exotic carps, common carp (Cyprinus cmpio) is favourite fish to the people of Bangladesh for its palatability, hardy nature, spawning nature, high growth rate and also for its high yield. The present study was undertaken with a view to study the growth response of the fish fed on a formulated standard diet at different feeding frequencies. In these regard different aspects of growth parameters like, food conversion ratio (FCR), specific growth rate (SGR), protein efficiency ratio (PER), apparent protein digestibility (APD) were studied. Materials and methods The feeding trial of common carp fry (Cyprinus cmpio, 0.45±0.03g) was carried out for a period of 45 days during the months of April to June'99 in glass aquaria of a static indoor fish rearing system in the laboratory of the Department of Fisheries Technology, Bangladesh Agricultural University, Mymensingh. Fry of common carp (C. cmpio) were collected from a private farm of Digharkanda, Mymensingh. They were transferred in a plastic stocking tank of 250L capacity and were given a prophylactic treatment with 0.5% NaCl dip for 20 minutes. Then they were bathed in 0.5 ppm methylene blue solution for 24 hours followed by an acclimatization with the experimental condition for 15 days in three aquaria with adequate aeration. During acclimatization the fish were fed pelleted diet containing 33% crude protein at a ration of 5% body weight. For the feeding trial ten rectangular glass aquaria ( 45cmx25cmx25cm) were used. About two-third of each of the aquarium was filled with tap water for the experiment and provided with artificial aeration using aquarium air pump (Daivo NS 4200). A natural photoperiod of day and night was maintained throughout the experiment. The ambient water temperature ranged between 27 and 32 C during the experimental period. Before formulating the diet, the dietary ingredients were subjected to proximate analysis (Horwitz 1984). The experimental diet contained fishmeal as major source of dietary protein together with other ingredients as wheat flour, carboxy methyl cellulose (CMC), tasting salt (monosodium glutamate, MSG), vit. premix (Rhone-Poulence, Bangladesh), chromic oxide, cx:-cellulose and soybean oil. All these ingredients were mixed at required amount so that the final diet contained 33% crude protein. The formulation of the diet with different ingredients and the proximate composition are shown in Table

3 Feeding frequency on the growth of common carp Table 1. Formulation of the experimental diet (33% crude protein level,% dry weight basis) Ingredients Fish meal Wheat flour Carboxy methyl cellulose Tasting salt Vit. Premix* Chromic. oxide oc-cellulose Soybean oil Total * Rhone-Poulence, Bangladesh. Amount(%) Proximate composition Dry matter Crude protein Crude lipid Ash Nitrozen free extract Gross energy (Kcal/g) % dry weight basis The feeding trial was conducted in five treatments named A, B, C, D and E each with two replicates. In each of the replicates, 15 fish were used. The fry in each replicate were fed at 5% ration level daily divided into different feeding frequencies of 2, 3, 4, 5 and 6 times respectively. Feeding was started at 9.00 am until 5.30 pm as per feeding frequencies. An adequate level of oxygen in each aquarium was ensured through artificial aeration by using aquarium air pump. Everyday in the morning before feeding started, about one-third water of aquaria was replaced by new water to keep the water quality as good as possible. Close observation was made during feeding so that no pelleted diet left uneaten in the aquaria. Siphoning method was followed to remove uneaten food (if any) and faeces from each aquarium. The total amount of feed fed was recorded for each treatment in order to subsequent calculation of SGR (Brown 1957) FCR (Castell and Tiews 1980), PER (Castell and Tiews, 1980) and APD (Maynard and Loosli 1969). Faeces were collected during the last week of the experimental period for analysis of protein digestibility of feed. Faeces from each aquarium were removed carefully by siphoning about 30 minutes after last feeding. These were collected separately from each replicate of all treatments and pooled together according to replicate and dried in oven at 70 C and then kept in airtight vials for subsequent chemical analysis. Chromic oxide in the diet and faeces was determined by using wet digestion technique of Furukawa and Tsukahara (1996). Percent APD of the experimental diet was calculated using the formula of Maynard and Loosli (1969). For growth data all experimental fish in each replicate of different treatments was individually weighed at every 15th days which was also used for adjusting ration. Fish were weighed up to the nearest O.Olg on a precise electronic balance. At the beginning of the experiment, 60 fish from the stocking tank was randomly collected, sacrificed, weighed and dried in oven for analyzing proximate composition as initial carcass composition of fish. At the end of the experiment, all fish of each of the replicates of treatments was weighed, sacrificed and dried in oven at 100 C for subsequent analysis 151

4 S. M. Sultana eta/. for proximate composition and other growth parameters. The proximate composition of dietary ingredients, diets, faeces and fish samples were analyzed according to methods described by Horwitz (1984). Data collected during growth trials and subsequent analysis of diets, faeces and carcass composition were used to determine growth parameters. One factor analysis of variance CANOVA) was performed to observe the effect of feeding frequency on the growth of fish in different treatments. For this purpose the percent data were converted to arcsine and then applied for analysis. This was followed by Tukey's multiple range test (Zar 1984) to analyze any significant difference between treatment means at 5% level of significance. Results and discussion It was observed that the increase of feeding frequency did not always produce increase in growth. Here, in this experiment four times feeding per day showed significantly (P<0.05) the best growth at the end of the experiment. The mean percent weight gain of fishes fed on diet at different feeding schedules of 2, 3, 4, 5 and 6 times a day were , , , and % respectively. The comparison on the mean percent weight gain in fish fry fed on diet at different feeding frequencies is given in Figure 1. Significantly (p<0.05) higher increase of mean percent growth was observed in the fish fed four times daily than the fish fed 2, 3, 5 and 6 times daily showing an increase of feeding frequency which did not increase the growth of fish progressively. The lowest (p<0.05) growth was found in fish having a feeding frequency of two times per day. Similar result was observed by Chiu et al. (1987), Charles et al. (1984) for the same species of C. cmpio. Capper et al. (1982) also reported different values of FCR for C. cmpio with formulated diet at different feeding frequencies. Thus a feeding schedule of four times a day seemed to be optimum resulting a good growth. "" loo Dap lo Fig. 1. Mean weight gain in C. carpio fed on the formulated diet at 5 frequencies of 2, 3, 4, 4;5 and 6 times (A, B, C, D and E respectively) daily for 45 days feeding trial. 152

5 Feeding frequency on the growth of common carp Specific growth rate (SGR) in treatments A, B, C, D and E were observed 2.58, 3.10, 3.24, 2.95 and 2.53 at feeding frequencies of 2, 3, 4, 5 and 6 times a day, respectively (Table 2). The SGR values in the treatment C (fish fed four times daily) was found significantly (p<0.05) higher than the others. The SGR increased with the increase in feeding frequency in a day reached to the peak at feeding frequency four times a day and then the value was decreased with the further increase in frequency (Chiu et al. 1987) Food conversion ratio (FCR) of the diet used for feeding at different frequencies of 2, 3, 4, 5 and 6 times a day were found 1.78, 1.47, 1.22, 1.35 and 1.57 respectively. Ahsan (1995) observed FCR values of 1.79 to 2.16 for Labeo rohita fed on diet containing 33.92% protein. In the present study the least FCR value was observed in the treatment where the fish fed with a feeding frequency of four times in a day (Table 2). It was significantly (p <0.05) different from other values except from the feeding frequency of 5 times a day. The protein efficiency ratio (PER) of the present study followed the trend opposite to FCR values and ranged from 1.68 to Significantly (p<0.05) the highest PER was produced by treatment C (four times feeding per day) followed by D, B, E and A, respectively. Choudhury (1998) reported that PER value of 2.14 to 2.32 for L. rohita. Thus a feeding schedule of 4 times a day seemed to be optimum resulting a good growth and may be suggested as a recommended frequency for culture of C. carpio. The apparent protein digestibility (APD) at different feeding schedules was found to be 71.01, 76.71, 81.76, and in different treatments A, B, C, D and E respectively. The highest APD value 81.76% was seen in fish fed at the frequency offour times per day and the least APD value was observed in treatment A at two times feeding per day. Carlos (1988) revealed similar result of growth response due to apparent protein digestibility in bighead carp fry. However, APD value in this study was slightly lower than that of J ayaram and She tty (1980) who reported that protein digestibility value was 91.88% in rohu fish fed on formulated diets containing 34.33% dietary protein. In another experiment, Biswas (1997) observed the APD value of 80.50% for Puntius gonionotous fed on diet containing fish meal having dietary protein of 33%. Choudhury (1998) also observed a similar APD value of 81.70% when Labeo rohita fed formulated diets containing 33% crude protein. Therefore, the APD values of the present experiment were varied much within the range found in related species as reported by different authors. In this study, the carcass composition did not show significant variation in respect to crude protein, lipid, moisture and ash content. Table 2. Growth parameters of Cyprinus carpio fed experimental diets for 45 days of feeding trial Treat- Mean Mean Mean% Total SGR FCR PER APD ments Initial Final weight amount of (%) (%) (%) weight (g) weight (g) gain feed fed (g) A 7.49' b ' ' 1.78' 1.68 e e B 5.61' b ' ' 1.47b 2.05 be 76.71'b c 6.93' 29.57' ' ' 1.22 e 2.48' 81.76' D 6.51' b ' ' 1.35 be 2.23'b 78.26'b E 7.81' b ' '!.57 ab 1.91 be be *Figures in the same column having the same superscripts are not significantly different (p>0.05) 153

6 S.M. Sultana et al. References Ahsan, M.N., Growth of rohu (Labeo rohita Ham.) fingerlings originating from hatcheries and those from wild sources fed on two formulated diets. M. S. Thesis, Department of Fisheries Technology. Bangladesh Agricultural University, Mymensingh. Biswas, M.R., Animal and plant protein diets in the growth of Puntius gonionotus fingerlings. M. S. Thesis, Department of Fisheries Technology, Bangladesh Agricultural University, Mymensingh. Brown, M.E. (ed.), Experimental studies on growth. In: The Physiology of Fishes. Vol. 1. Academic Press, New York. pp Capper, B.S., J.F. Wood and A. J. Jackson, The feeding value for carp of two types of mustard oil cakes from Nepal. Aquaculture, 29: Carlos, M.H., Growth and survival of big head carp (Aristichthys nobilis) fry fed at different intake levels and feeding frequency. Aquaculture, 6: Castell, J.D. and K. Tiews (eds.), Report of the EIFAC and ICES working group on the standardization of methodology in fish nutrition research. Hamburg, Federal Republic of Germany, march, EIFAC Technical paper, 256 p. Charles, P. M, S.M. Sebastian, M. C. V. Raj and M.P. Marian, Effect of feeding frequency on growth and food conversion ofcyprinus carpio fry.aquaculture, 40: Chiu, Y. N., N. S. Sumagaysay and M.G. S. Sastrillo, Effect offeeding frequency and feeding rate on the growth and feed efficiency of milk fish, Chanos chanos (Forskal) juveniles. Asian Fish. Sci., 1: Choudhury, B.B.P., Relationship between feeding frequency and growth of one Indian major carp Labeo rohita (Ham) fingerlings fed on different formulated diets. M. S. Thesis, Department of Fisheries Technology, Bangladesh Agricultural University, Mymensingh. De Silva, S.S., and F.B. Davy, Fish nutrition research for semi-intensive culture system in Asia. Asian Fish. Sci., 5: Furukawa, A. and H. Tsukahara, On the acid digestion method for determination of Chromic oxide as an indicator substance in the study of digestibility in fish. Japan Soc. Sci. Fish., 32: Howrwitz, W. (ed.), Official Methods of Analysis of the Association of Official Analytical Chemists. 14th edition. Association of Official Analytical Chemists Washington D.C., USA. 1018p. Jayaram, M.C. and H.P.C. Shetty, Studies on the growth rates of catla, rohu and common carp fed on different formulated feeds. Mysore J. Agril. Sci., 14(4): Maynard, L.A. and J,K. Loosli, Animal nutrition. 6th edition. Me. Grow-Hill. Book company. 613p. Murai, T. and J.W. Andrews, Effect of frequency offeeding on growth and food conversion of channel cat fish fry. Bull. Jap. Soc. Sci. Fish., 42: Rajan, M.R., J.T. Begam, D. Thilagavathy and T. Daniel, Feed utilization and growth of Cyprinus carpio var. Communis in relation to different protein levels. Environment and Ecology. 14(1): Zar, J. H, Biostatistical Analysis (Second ed.). Prentice Hall International, Inc. New-Jersey. 718 p. (Manuscript received 4 March 2000) 154